functional programming - Check order of two elements in Java-8-Stream -

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i want check order of 2 elements in java-8-stream. have iterator-solution:

public static boolean isbefore (a a1,                                 a2,                                 stream<a> as) {     iterator<a> = as.iterator ();     while (it.hasnext ()) {         a = it.next ();         if (a == a1) {             return true;         } else if (a == a2) {             return false;         }     }     throw new illegalargumentexception (         a1 + " , + " a2 + " arent elements of stream!"); }

is there solution without iterators in more functional/non imperative style?

it this

as.filter (a -> (a==a1) || (a==a2)).findfirst ()

and check if result a1 or a2 or empty. i'm sorry don't give full solution, it's hard if smart phone


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